Effects of Post Heat-Treatment on Surface Characteristics and Adhesive Bonding Performance of Medium Density Fiberboard

Ayrılmış, Nadir; Winandy, Jerrold E.

doi:10.1080/10426910902748032

Cited by 66 publications

(36 citation statements)

References 19 publications

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“…the contour of the surface, has a significant effect on the distribution of the shear forces [39]. The results of the contact profilometry of this study are in line with the previously published literature, where similar tests have been conducted with other wood species treated with different heat treatment methodologies [40][41][42][43]. The mechanism of the heat treatment-induced decrease in roughness is not clear.…”

Section: Surface Profilometrysupporting

confidence: 85%

Effect of heat treatment of wood on the morphology, surface roughness and penetration of simulated and human blood

Rekola

Lassila

Nganga

et al. 2014

Bio-Medical Materials and Engineering

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BACKGROUND: Wood has been used as a model material for the development of novel fiber-reinforced composite bone substitute biomaterials. In previous studies heat treatment of wood was perceived to significantly increase the osteoconductivity of implanted wood material. AIM: The objective of this study was to examine some of the changing attributes of wood materials that may contribute to improved biological responses gained with heat treatment. METHODS: Untreated and 140 • C and 200 • C heat-treated downy birch (Betula pubescens Ehrh.) were used as the wood materials. Surface roughness and the effect of pre-measurement grinding were measured with contact and non-contact profilometry. Liquid interaction was assessed with a dipping test using two manufactured liquids (simulated blood) as well as human blood. SEM was used to visualize possible heat treatment-induced changes in the hierarchical structure of wood. RESULTS: The surface roughness was observed to significantly decrease with heat treatment. Grinding methods had more influence on the surface contour and roughness than heat treatment. The penetration of the human blood in the 200 • C heattreated exceeded that in the untreated and 140 • C heat-treated materials. SEM showed no significant change due to heat treatment in the dry-state morphology of the wood. DISCUSSION: The results of the liquid penetration test support previous findings in literature concerning the effects of heat treatment on the biological response to implanted wood. Heat-treatment has only a marginal effect on the surface contour of wood. The highly specialized liquid conveyance system of wood may serve as a biomimetic model for the further development of tailored fiber-composite materials.

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Section: Surface Profilometrysupporting

confidence: 85%

Effect of heat treatment of wood on the morphology, surface roughness and penetration of simulated and human blood

Rekola

Lassila

Nganga

et al. 2014

Bio-Medical Materials and Engineering

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“…All approaches presented had advantages and drawbacks. In general, the mechanical performance and bonding quality of treated plywood diminished after TM; the wooden surfaces exposed to high temperature might be subjected to surface inactivation with possible adhesion problems during its manufacturing (Ayrilmis and Winandy 2009). While the production of heat-treated poplar plywood is feasible, it needs important improvements to avoid reductions in mechanical properties (Goli et al 2014).…”

Section: Introductionmentioning

confidence: 99%

Thermo-Vacuum Modification of Poplar Veneers and its Quality Control

Sandak¹,

Allegretti²,

Cuccui³

et al. 2016

BioResources

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Poplar wood is commonly used for many purposes due to its easy machinability, low density, uniform light colour, and relatively low cost. Here, vacuum thermal treatment is proposed for upgrading veneers in the manufacturing of plywood panels with resulting reduced hygroscopicity, improved durability, and dimensional stability. Thirty-eight batch processes with different treatment conditions (temperature ranging from 150 to 240 °C, time from 0.5 to 22.5 h and pressure from 100 to 1000 mbar) were performed to characterize the influence of process parameters on the product properties. Samples were characterized considering their appearance (colour) and their physical (mass loss and equilibrium moisture content), mechanical (bending strength), and chemical (investigated with near infrared spectroscopy (NIR)) properties. The darkening of poplar veneers and the reduction of mechanical strength were observed with increased treatment time and intensity. Mass loss closely correlated with colour change, resulting from chemical changes in wood components. Principal component analysis (PCA) and partial least squares (PLS) were used for evaluation of near infrared spectral data. Both were correlated with several technical properties, and thus NIR allowed the simultaneous prediction of several of these properties. Both colour change and NIR could be used to optimize the thermal treatment of poplar veneers at the industrial scale and for realtime statistical process control.

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“…In most of the cases, the adhesive bond performance of the wood is negatively affected by the higher temperature and higher treatment period [17,18]. However, some studies reported that a better bonding strength is achieved with lower heating treatment conditions which use lower temperature and duration [14,[19][20][21].…”

mentioning

confidence: 99%

“…The higher shear strength value was obtained for the plywood sample having a smoother surface at 52 °C. Ayrilmis et al [18] investigated the effect of heat treatment on adhesive bonding performance and concluded that the bonding strength of the heat-treated medium density fiberboard panels decreased with increasing contact angle even though the surface roughness improved. Surface wettability mechanism of material after heat treatment plays an important role for the bond performance [22][23][24][25].…”

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confidence: 99%

Effects of heat treatment on the behavior of teak wood adherends bonded joints

Budhe

Ghugal²,

Barros

2020

Appl Adhes Sci

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IntroductionNowadays, scientific communities and industries are looking for alternative materials to the synthetic composites and metals, as these materials are non-degradable, limited in quantity, hazardous to nature and costly [1,2]. Hence many researchers are attracted towards natural materials (e.g. wood) for various applications, such as construction, furniture, decorative products, sports items and many others. Wood is one of the most important materials and widely used since the old era, as it is easily available, ecofriendly, light weight and low cost among many more benefits compared to others [3,4]. However, the hygroscopicity of wood is the major disadvantage which limits the usage of wood for many applications. There are different processes by which the hygroscopicity of wood can be reduced and many studies have been carried out in the literature on different processes [5,6].Heat treatment is the oldest and simplest method by which wood hygroscopicity can be effectively decreased. In addition, the dimensional stability, biological resistance and durability of the wood can also be improved [7][8][9]. It was showed that the heat treatment of wood not only reduced the hygroscopicity but also caused physical changes in the wood such as surface modification, which can significantly affect the adhesive bond AbstractThe main aim of this work is to investigate the effect of heat treatment on the teak wood adherend bonded joints. Indian teak wood samples were kept in an oven at 150 °C for 2 h for the heat treatment process. The surface roughness values of the wood adherend before and after the heat treatment process were measured using a surface profilometer. Wettability of un-treated and heat-treated teak wood samples was determined with the contact angle measurements by using the sessile drop method. Single strap joints with un-treated and heat treated wood specimens were tested at ambient temperature. The results show that, there is a clear dependency observed in between the heat treatment and the surface roughness of the wood adherends. Wettability of teak wood adherend surface is degraded after the heat treatment process. An adverse effect of heat treatment of wood adherend on the bonding strength was observed, but the surface roughness was improved.

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Effects of Post Heat-Treatment on Surface Characteristics and Adhesive Bonding Performance of Medium Density Fiberboard

Cited by 66 publications

References 19 publications

Effect of heat treatment of wood on the morphology, surface roughness and penetration of simulated and human blood

Effect of heat treatment of wood on the morphology, surface roughness and penetration of simulated and human blood

Thermo-Vacuum Modification of Poplar Veneers and its Quality Control

Effects of heat treatment on the behavior of teak wood adherends bonded joints

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